Trojan.DownLoader12.26729

Technical Information

To ensure autorun and distribution:

Modifies the following registry keys:

[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon] 'Userinit' = '<SYSTEM32>\userinit.exe,%ALLUSERSPROFILE%\vesswIQA\AcIcUcAM.exe,'
[<HKLM>\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] 'AcIcUcAM.exe' = '%ALLUSERSPROFILE%\vesswIQA\AcIcUcAM.exe'
[<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'jaQEcQMQ.exe' = '%HOMEPATH%\NIMMEwsg\jaQEcQMQ.exe'

Creates the following services:

[<HKLM>\SYSTEM\ControlSet001\Services\FkYQcQph] 'Start' = '00000002'

Malicious functions:

To complicate detection of its presence in the operating system,

forces the system hide from view:

hidden files
file extensions

blocks the following features:

User Account Control (UAC)

Creates and executes the following:

'%ALLUSERSPROFILE%\lwQggIEM\nwAEcgMA.exe'
'%ALLUSERSPROFILE%\vesswIQA\AcIcUcAM.exe'
'%HOMEPATH%\NIMMEwsg\jaQEcQMQ.exe'

Executes the following:

'<SYSTEM32>\cmd.exe' /c ""%TEMP%\LUsUoMMc.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\tiooAEMo.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\uykQowQU.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\GegEEkos.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\ZegsAsYA.bat" "<Full path to virus>""
'<SYSTEM32>\wbem\wmiadap.exe' /R /T
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\LGcUAYsw.bat" "<Full path to virus>""
'<SYSTEM32>\reg.exe' add HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /d 0 /t REG_DWORD /f
'<SYSTEM32>\reg.exe' add HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced /f /v Hidden /t REG_DWORD /d 2
'<SYSTEM32>\reg.exe' add HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced /f /v HideFileExt /t REG_DWORD /d 1
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\EOEckEwc.bat" "<Full path to virus>""
'<SYSTEM32>\cscript.exe' %TEMP%\file.vbs
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\qswgscwM.bat" "<Full path to virus>""

Modifies file system :

Creates the following files:

C:\RCX13.tmp
<Current directory>\vWAU.ico
<Current directory>\OEsC.exe
<Current directory>\XMUu.exe
<Current directory>\gcAY.exe
C:\RCX12.tmp
<Current directory>\KUQo.ico
<Current directory>\zAEs.ico
<Current directory>\PUkw.exe
C:\RCX16.tmp
C:\RCX15.tmp
C:\RCX14.tmp
<Current directory>\PMYo.ico
<Current directory>\rkcu.exe
C:\RCXF.tmp
<Current directory>\pgAc.ico
%TEMP%\FCcMEYMM.bat
<Current directory>\MUEq.exe
<Current directory>\ugAC.exe
C:\RCXE.tmp
<Current directory>\bQQA.ico
%TEMP%\LUsUoMMc.bat
C:\RCX11.tmp
<Current directory>\mCEc.ico
<Current directory>\YocK.exe
<Current directory>\QYsK.exe
C:\RCX10.tmp
<Current directory>\DKME.ico
<Current directory>\NYAQ.ico
<Current directory>\IOgc.ico
<Current directory>\xkkg.exe
C:\RCX1C.tmp
%TEMP%\GegEEkos.bat
<Current directory>\iIYQ.exe
C:\RCX1B.tmp
%TEMP%\zCIYIEss.bat
<Current directory>\WIkQ.exe
C:\RCX1E.tmp
%TEMP%\fEockwIk.bat
<Current directory>\DgYA.ico
<Current directory>\bKYo.ico
<Current directory>\GoUS.exe
C:\RCX1D.tmp
C:\RCX18.tmp
%TEMP%\eMEQUcgw.bat
<Current directory>\yKIU.ico
<Current directory>\bMwy.exe
<Current directory>\FcoU.exe
C:\RCX17.tmp
<Current directory>\ASIg.ico
<Current directory>\LwYW.exe
C:\RCX1A.tmp
<Current directory>\quQA.ico
<Current directory>\HqMw.ico
<Current directory>\IUoE.exe
C:\RCX19.tmp
%TEMP%\ZegsAsYA.bat
C:\RCX3.tmp
<Current directory>\cWsE.ico
<Current directory>\oQck.exe
<Current directory>\qAgM.exe
<Current directory>\CQse.exe
C:\RCX2.tmp
<Current directory>\LMww.ico
%TEMP%\MgEgkYgc.bat
<Current directory>\IcwI.ico
<Current directory>\NMgi.exe
C:\RCX5.tmp
C:\RCX4.tmp
<Current directory>\QcIE.ico
<Current directory>\jIUs.exe
%TEMP%\uSEUcggs.bat
<Current directory>\<Virus name>
%ALLUSERSPROFILE%\casg.txt
C:\Documents and Settings\LocalService\NIMMEwsg\jaQEcQMQ
%HOMEPATH%\NIMMEwsg\jaQEcQMQ
%ALLUSERSPROFILE%\vesswIQA\AcIcUcAM
%ALLUSERSPROFILE%\lwQggIEM\nwAEcgMA.exe
C:\RCX1.tmp
%TEMP%\file.vbs
<Current directory>\HKEE.ico
<Current directory>\vIMq.exe
%TEMP%\SYkQUgAk.bat
<Current directory>\YIEE.ico
%TEMP%\qswgscwM.bat
C:\RCX6.tmp
C:\RCXB.tmp
<Current directory>\oAMY.ico
<Current directory>\vMUS.exe
<Current directory>\zwok.exe
C:\RCXA.tmp
%TEMP%\uykQowQU.bat
<Current directory>\mCkE.ico
C:\RCXD.tmp
%TEMP%\tiooAEMo.bat
<Current directory>\kiwI.ico
<Current directory>\DIMS.exe
C:\RCXC.tmp
<Current directory>\DEUw.ico
%TEMP%\BeQUEwIg.bat
<Current directory>\JmcA.ico
<Current directory>\zAgq.exe
C:\RCX8.tmp
C:\RCX7.tmp
%TEMP%\EOEckEwc.bat
<Current directory>\aQoA.ico
<Current directory>\WUEy.exe
%TEMP%\LGcUAYsw.bat
<Current directory>\yiow.ico
<Current directory>\nwoE.exe
C:\RCX9.tmp
%TEMP%\HKAsooYA.bat
<Current directory>\YuUI.ico
<Current directory>\hEIE.exe

Deletes the following files:

<Current directory>\OEsC.exe
<Current directory>\vWAU.ico
<Current directory>\XMUu.exe
<Current directory>\KUQo.ico
<Current directory>\PUkw.exe
<Current directory>\zAEs.ico
<Current directory>\rkcu.exe
<Current directory>\PMYo.ico
<Current directory>\QYsK.exe
<Current directory>\pgAc.ico
<Current directory>\bQQA.ico
%TEMP%\FCcMEYMM.bat
<Current directory>\gcAY.exe
<Current directory>\mCEc.ico
<Current directory>\YocK.exe
<Current directory>\DKME.ico
<Current directory>\FcoU.exe
%TEMP%\zCIYIEss.bat
<Current directory>\xkkg.exe
<Current directory>\iIYQ.exe
<Current directory>\quQA.ico
<Current directory>\bKYo.ico
<Current directory>\WIkQ.exe
<Current directory>\IOgc.ico
<Current directory>\GoUS.exe
<Current directory>\bMwy.exe
<Current directory>\ASIg.ico
<Current directory>\NYAQ.ico
%TEMP%\eMEQUcgw.bat
<Current directory>\LwYW.exe
<Current directory>\HqMw.ico
<Current directory>\IUoE.exe
<Current directory>\yKIU.ico
<Current directory>\MUEq.exe
<Current directory>\jIUs.exe
<Current directory>\QcIE.ico
<Current directory>\oQck.exe
<Current directory>\cWsE.ico
<Current directory>\IcwI.ico
<Current directory>\WUEy.exe
%TEMP%\MgEgkYgc.bat
<Current directory>\NMgi.exe
<Current directory>\vIMq.exe
<Current directory>\YIEE.ico
%TEMP%\uSEUcggs.bat
%TEMP%\SYkQUgAk.bat
<Current directory>\qAgM.exe
<Current directory>\LMww.ico
<Current directory>\CQse.exe
<Current directory>\HKEE.ico
<Current directory>\aQoA.ico
<Current directory>\oAMY.ico
%TEMP%\BeQUEwIg.bat
<Current directory>\mCkE.ico
<Current directory>\vMUS.exe
<Current directory>\ugAC.exe
<Current directory>\kiwI.ico
<Current directory>\DIMS.exe
<Current directory>\DEUw.ico
%TEMP%\HKAsooYA.bat
<Current directory>\hEIE.exe
<Current directory>\zAgq.exe
<Current directory>\JmcA.ico
<Current directory>\yiow.ico
<Current directory>\zwok.exe
<Current directory>\YuUI.ico
<Current directory>\nwoE.exe

Moves the following files:

from C:\RCX14.tmp to <Current directory>\OEsC.exe
from C:\RCX15.tmp to <Current directory>\rkcu.exe
from C:\RCX16.tmp to <Current directory>\PUkw.exe
from C:\RCX13.tmp to <Current directory>\XMUu.exe
from C:\RCX10.tmp to <Current directory>\QYsK.exe
from C:\RCX11.tmp to <Current directory>\YocK.exe
from C:\RCX12.tmp to <Current directory>\gcAY.exe
from C:\RCX17.tmp to <Current directory>\FcoU.exe
from C:\RCX1C.tmp to <Current directory>\xkkg.exe
from C:\RCX1D.tmp to <Current directory>\GoUS.exe
from C:\RCX1E.tmp to <Current directory>\WIkQ.exe
from C:\RCX1B.tmp to <Current directory>\iIYQ.exe
from C:\RCX18.tmp to <Current directory>\bMwy.exe
from C:\RCX19.tmp to <Current directory>\IUoE.exe
from C:\RCX1A.tmp to <Current directory>\LwYW.exe
from C:\RCX5.tmp to <Current directory>\jIUs.exe
from C:\RCX6.tmp to <Current directory>\NMgi.exe
from C:\RCX7.tmp to <Current directory>\WUEy.exe
from C:\RCX4.tmp to <Current directory>\oQck.exe
from C:\RCX1.tmp to <Current directory>\vIMq.exe
from C:\RCX2.tmp to <Current directory>\CQse.exe
from C:\RCX3.tmp to <Current directory>\qAgM.exe
from C:\RCX8.tmp to <Current directory>\zAgq.exe
from C:\RCXD.tmp to <Current directory>\DIMS.exe
from C:\RCXE.tmp to <Current directory>\ugAC.exe
from C:\RCXF.tmp to <Current directory>\MUEq.exe
from C:\RCXC.tmp to <Current directory>\vMUS.exe
from C:\RCX9.tmp to <Current directory>\hEIE.exe
from C:\RCXA.tmp to <Current directory>\nwoE.exe
from C:\RCXB.tmp to <Current directory>\zwok.exe

Network activity:

Connects to:

'74.##5.232.51':80
'bl##k.io':443

TCP:

HTTP GET requests:

74.##5.232.51/

UDP:

DNS ASK google.com
DNS ASK bl##k.io

Miscellaneous:

Searches for the following windows:

ClassName: '' WindowName: 'Microsoft Windows'
ClassName: '' WindowName: 'jaQEcQMQ.exe'
ClassName: 'Indicator' WindowName: ''
ClassName: '' WindowName: 'AcIcUcAM.exe'

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